Open sign



FIG. 1 is an isometric view of an open sign in accordance with my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is an enlarged top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a right end elevation view thereof; and,

FIG. 7 is a left end elevation view thereof.

In the drawings, the broken lines represent portions of the open sign that form no part of the claimed design. 

CLAIM The ornamental design of an open sign, as shown and described. 